Cylinder block ridge grinder



C. O. DUTRO CYLINDER BLOCK RIDG Dec. 4,1956

E GRINDER 2 Sheets-Sheet 1 Filed Nov. 12, 1952 INVENTOR, I fazlae a Jaim- Dec, 4, 1956 c. o. DUTRO CYLINDER BLOCK RIDGE GRINDER 2 Sheets-Sheet 2 Filed Nov. 12, 1952 INVEN TOR, 6751/42? Qfiairo BY M (M,

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United States Patent CYLINDER BLOCK RIDGE GRINDER Claude 0. Dutro, Joplin, Mo.

Application November 12, 1952, Serial No. 319,870

2 Claims. (Cl. 51-245) This invention relates to new and useful improvements in devices for dressing the inner surfaces of the cylinders of an internal combustion engine, and has for its primary object the provision of means for efliciently removing the ridge from the top portions of worn cylinder blocks, so that rings may be easily inserted.

Another object of this invention is the provision of a cylinder ridge grinder having novel adjustable means for holding the grinder in proper position in the cylinder to remove the ridge therefrom.

A further object of the invention is the provision of means whereby the grinding wheel and associated driving parts may be moved around in an orbit to carry out the grinding of the bore of a cylinder and to remove the ridge from the cylinder adjacent the top of the block.

Other objects are simplicity and economy of construction, ease and accuracy of operation, and adaptability for use in cylinders of various sizes.

With these objects in view, as well as other objects which will appear in the course of the specification, reference will be had to the drawing, wherein:

Fig. l is a side elevational view of a grinding device embodying the present invention, shown positioned in a cylinder shown in cross section.

Fig. 2 is a plan view of the device shown in Fig. l, with the driving clutch removed.

Fig. 3 is a cross sectional view taken on line IIIIII of Fig. 2.

Fig. 4 is an irregular sectional view taken on line IV-IV of Fig. 2.

Fig. 5 is a detached plan view of the body member of the grinding device.

Fig. 6 is a fragmentary sectional view of the upper portion of the device taken on line Vl-VI of Fig. 2.

Fig. 7 is a fragmentary sectional view taken on line VII--VII ofFig. 1.

Fig. 8 is a plan view showing the bearing plate detached.

Throughout the several views of the drawing like reference characters apply to similar parts, and the numeral 10 refers to a conventional cylinder block for an internal combustion engine, having a cylindrical bore 12 and a planar top surface 13. The bore, when the engine becomes worn, will present an objectional ridge 14 adjacent the top of the block. It is to remove this ridge that the grinding device 16 is provided. This device has a cylindrical body member 18 open at both ends and provided with like diametrically positioned partition or shelf members 20 and 22 positioned respectively in spaced relation from the upper and lower ends of member 18. These partition members are preferably integral with or rigidly secured to the inner Wall of member 18 by welding. Partition members 20 and 22 are respectively slotted at 24 and 26 and provided with bearing plates 28 and 30, each of which has a centering hole 27 and a relatively large hole 29 formed therein. Partition member 20 and bearing plate 28 are clampingly secured together by means of bolt 32, which is provided with a 2,772,529 Patented Dec. 4, 1956 nut 34. Mounted on bolt 32 at opposite sides of the assembled bearing plate 28 and partition member 20 is a pair of washers 36. Likewise partition member 22 and bearing plate 30 are secured together by means of bolt 38, nut 40, and washers 42.

A grinding wheel 44 is mounted adjacent the upper threaded end 46 of shaft 48. Grinding wheel 44 is cylindrically formed and centrally bored at 50 to fit on shaft 48 and is clampingly secured thereto by means of nut 52 which rests against the under side of wheel 44 and nut 54 which rests on top of wheel 44, with a washer 56 therebetween.

Mounted on shaft 48 below nut 52 is a washer 58 hav ing opposed convex faces 60. Washer 58 rests on top of an elongated sleeve 62 through which shaft 48 extends to pass through partition member 20 and on down through partition 22 and bearing plate 30 to receive a washer 64 which is secured in position by means of cotter pin 66. Sleeve 62 extends through larger hole 29 of upper bearing plate 28, but the lower end of said sleeve rests for support on the upper surface of lower bearing plate 30, only the shaft 48 passing through hole 29 of said lower bearing plate. Referring to Fig.4 it will be noted that shaft 48 is slightly inclined from the vertical so that the bottom face of wheel 44 is slightly angled to the planar face of body member 18 and to the cylindrical bore 12, so that when the wheel 44 is positioned as shown in Figs. 2 and 4 and the wheel is rotated clockwise as indicated by the arrow in Fig. 2, the wheel when driven at a high rate of speed will feed downwardly into cylinder block 10 and will be gradually forced in an anticlockwise direction about the inner periphery of the cylinder to grind away the ridge 14. When the ridge has been entirely ground away there will be no tendency for the grinding wheel to move about the inner periphery of said cylinder as hereinafter set forth.

The upper end portion 70 of shaft 48 is reduced and made cylindrical to receive the jaws 72 of a conventional chuck 74 having drive shaft 76 for imparting angular velocity to said grinding wheel. This shaft 76 may be driven directly by means of an electric hand drilling tool, or by means of a flexible shaft driven by a remote power unit.

For properly guiding the grinding device into the cylinder during the ridge grinding operation a pair of upper adjustable guide bolts 78 are radially mounted in body member 18, by means of a threaded sleeve member 80 rigidly fixed to said body member to receive said bolt for radial adjustment therein. A lock nut 82 positioned on the inner end portion of bolt 78 serves to secure said bolt in the desired set position during the grinding operation. It will be noted that guide bolts 78 are rounded at their outer ends to make good smooth contact with the cylinder wall and they are respectively positioned at opposite sides of the extended diameter of wheel 44 so that with the grinding wheel they present a threepoint contact with the cylinder being ground to retain the grinding device in proper relation with the cylinder be ing ground.

It will be noted that these bolts rest against the surface of ridge 14- (see Fig. 6) and that as the grinder is moved into the cylinder the bolts will move outwardly to contact the face 84 of the body of the cylinder, thus causing the grinding wheel to move inwardly from its grinding position the thickness of the ridge, which is usually a few thousandths of an inch. During the setting of the grinding wheel for the proper removal of ridge 14 the wheel is adjusted and set to extend radially from the body member 18 a distance about twice the thickness of ridge 14 so that when the grinding wheel starts grinding it will cut into the block too deep. However, before the cut has moved into the block much less than the width of the ridge the guidebolts will have moved outwardly against the cylinder wall 84 and the grinding wheel will move to a cutting position to just remove the ridge 14.

The means for regulating the depth of insertion of the grinding device into the cylinder comprises three equally spaced rider members 86 carried by body member 18. Each rider member includes a threaded sleeve 88 integral with said body member and disposed in parallel relation to the axis of said body member to receive the threaded leg 90 of a right-angled rod member 92 having a leg 94 extending radially above the planar surface 13 of the cylinder block 10. A lock nut 96 operatively mounted on the threaded leg 90 serves to lock the member 92 in the adjusted position, to limit the downward movement of the grinder into the cylinder. It is the purpose of this invention that said rider members be so set that when the grinding device has been lowered so that the entirev ridge has been cut away the radial arms will rest on the top surface 13 of cylinder block 10.

Means for centering the lower end portion of body member 18 include a pair of spaced apart guide bolts 99 similar to bolts 78 and set in like manner to cooperate with resilient member 98 to present a three-point contact with the cylinder wall to center the lower end of the body member during the grinding operation. Resilient member 98 comprises an arcute spring member 108 secured to body member 18 at its one end by a rivet 102, the other end portion thereof is provided with a s pin 104 which extends through an opening 106 formed through the wall of the body member to contact the wall 84 of the cylinder. This resilient member tends to urge bolts 99 tightly against wall 84, and at the same time is adapted to be compressed into member 18 to permit the easy insertion of the device into the cylinder past the ridge 14.

In positioning the grinding device into the operating position in cylinder bore 12 the operator inserts the lower portion of the device after properly adjusting screws 99 to the size of the body of the cylinder, by compressing the pin 184 into the body of member 18. Bolts 78 are next set to form a three-point contact of the two bolts 78 and the opposite periphery of body member 18 at the ridge 14. The bearing plates 28 and are now adjusted so as to position the edge portion of grinding'wheel 44 beyond the periphery of ridge 14 twice the thickness of said ridge. It will be noted that grinding wheel 44 is slightly tilted relative to the surface 13 of the cylinder block 10 with its forward edge 108 slightly lower than its rear edge 110. With the grinding wheel so tilted and when driven at a high rate of speed in the direction indicated by the arrow 71 in Fig. 2, the cutting action will draw the wheel into the body of the block until the rider members rest on the surface 13 of the block 10. During the grinding operation, the entire device will be rotated entirely around the periphery of said cylinder in the direction indicated by the arrows 73 until the ridge is entirely ground 'away. When the ridge is entirely cut away the grinding device will have no further urge to rotate in the cylinder and will stand still and can be removed from the cylinder block for positioning it in the next cylinder in the block.

Due to the slight thickness of the ridge 14 it has been advisable to exaggerate said dimension to properly indioate the relationship of the parts, which otherwise would not be readily apparent.

What I claim as new and desire to protect by Letters Patent is:

1. A ridge grinding device for the cylinders of engine blocks comprising a body member, centering members carried by said body member and operable to engage slidably the walls of a cylinder into which said body member is inserted, whereby to support said body member for free rotational and axial movement in said cylinder, and a grinding wheel carried rotatably by said body member and positioned to grind the wall of a cylinder in which said body member is positioned, the axis of said grinding wheel being disposed eccentrically to the axis of said body member and inclined slightly relatively thereto in a plane at right angles to the direction of eccentricity thereof, at least certain of said centering members being provided with resilient means urging them radially outwardly relative to the body member, whereby they may be pressed inwardly to permit the insertion of the body member into a cylinder when the wall of said cylinder is ridged.

2. A ridge grinding device for the cylinders of engine blocks comprising a body member, centering members carried by said body member and operable to engage slidably the walls of a cylinder into which said body member is inserted, whereby to support said body member for free rotational and axial movement in said cylinder, and a grinding wheel carried rotatably by said body member and positioned to grind the wall of a cylinder in which said body member is positioned, the axis of said grinding wheel being disposed eccentrically to the axis of said body member and inclined slightly relatively thereto in a plane at right angles to the direction of eccentricity thereof, stop members affixed to said body member in axially offset relation from said grinding wheel, and projecting radially whereby to engage said engine block adjacent said cylinder, whereby to limit the travel of said grinding wheel into said cylinder.

References Cited in the file of this patent UNITED STATES PATENTS 386,848 Rast July 31, 1888 1,032,193 Elliott July 9, 1912 1,219,827 Leschler Mar. 20, 1917 1,365,149 Breed Jan. 11, 1921 1,374,599 Moore Apr. 12, 1921 1,408,578 Garner Mar. 7, 1922 1,513,604 Kosmos Oct. 28, 1924 1,933,677 Moore Nov. 7, 1933 2,521,210 Fulmer Sept. 5, 1950 2,541,412 Frost Feb. 13, 1951 2,546,490 Baldwin Mar. 27, 1951 FOREIGN PATENTS 22,380 Great Britain Oct. 22, 1908 135,918 Germany Nov. 21, 1902 

